Dual gas burner



Aug. 16, 1932. DM Q I 1,871,783

DUAL GAS BURNER Original Filed Feb. 27, 1928 I 20 .k Z i o INVENTORArthur Friedmm 7w ATTO Y Patented Aug. 16, 1932 V UNITED STATES.

PATENT OFFICE ARTHUR FRIEDMAN, OF CLEVELAND, OHIO, ASSIGNOR TO THECLEVELAND HEATER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF O HIODUAL GAS BURNER Original application filed February 27, 1928, Serial No.257,221. Divided and this application filed December 15, 1930.

This invention relates to gas burners and is filed as a divisionalapplication of my copending application for United States Let tersPatent Serial Number 257,221, filed February 27, 1928, for gas burner.

In gas burners of conventional type which are used inconnection withdomestic hot water supply heaters a very common method of using theburner is to operate it so that it burns at alltimes with a very smallflame that supplies just enough heat to maintain the storage water ofthe system at approximately the desired temperature.

The ordinary and most common type of blue flame gas burner is notparticularly well adapted to be used in this manner and if it is turneddown too low the flame is easily extinguished by drafts and changes ofpressure in the gas, both of which have been the source of manyaccidents. 7

Another difliculty encountered when burners of the stated type areoperated with yery low flame is due to the tendency they have offlashing back and burning in the mixing tube. A burner operating in thismanner produces a considerable amount of carbon monoxide.

It is to overcome these and other difficulties encountered in theoperation of gas fired domestic water heaters that my invention isparticularly directed to.

One of the objects of my invention is to provide a gaseous fuel burnerthat may be operated with a small flame that is not easily extinguishedand that provides just sufiicient heat to maintain the li uid contentsof a I storage container at a pre etermined temperature.

A further object of my invention is to pro vide in a single burnercasting, two independently operable burners which are so arranged thatthe gas is uniformly supplied to all of the ports of the two burners.

In general my improved burner consists of 7 two independent burnersintegrally formed in a single casting, either burner of which may beoperated independently of the other, depending upon the quantity of heatrequired. I

At the present time there are several kinds of domestic heaters whichare provided with Heaters of this sort are Serial No. 502,287. r

a small burner that can be operated at full capacity withoutover-heating the water. commonly referred to as flat rate heaters. It isfound in practice that this type of water heater will furnish hot waterat a given rate and when the demand exceeds the capacity of the heaterit is necessary to wait for a considerable length. of time before thewater is again brought. up to the desired temperature.

In my improved burner provision is made for maintaining a constantsupply of hot water for normal demands. Provision is also made forincreasing-the capacity of the water heater at such times as may bedesired.

L I accomplish this by the use of a double burner which at times may beoperated at a low rate of gas consumption to supply the normal demandfor hot water. amount of water in excess of the normal ,demand isdesired, the capacity of the heater may be increased by bringing asecond or When an heater of the conventional type embodying one form ofmy improved burner.

Figure 2 is an enlarged view partly in section of the burner andassociated parts and in which the burner head is shown in a 'sectionalView taken on lin'e2 2 of Figure 3.

Figure 3 is a plan view of the burner or burner head shown in Figure 2.

Figure 4'is a sectional view taken on line 44, Figure 2.

' In Figure 1, the numeral 1 indicates a storage tank providing acontainer for the water which is heated by a side arm circulating heater2. The heater 2 consists of a heater casing or jacket-3, which providesa housing for the circulating coils 4, and my improved gas burner 5. Thecirculating coils 4 are placed in communication with the tank 1 at theirlower end by means of the union connection 7, and at their upper end bya short section of pipe 9, which is connected to its upper end to the Lfitting 8, received in a suitlower end to the union-connection 10 ofthe.

circulating coils.

the upper tapered end 25 of a Bunsen tube 11 of conventional design. Adrip pan 12 is carried on this tube below the burner for the purpose ofreceiving and evaporating the water which results from the condensationof the products of combustion from the gas burner 5, that collect on theheater coils 4.

The raised portion 13 of the burner, is provided with a series'of burnerports 18 communicating with the chamber 28. The chamber 28 and ports 18are adapted to be supplied with a combustible mixture of gas and air byway of the cored passageway 14 and a gas and air mixing tube 15, whichis connected to an L fitting 21 communicating with the gas supplyconduit 20. The conduit 20 is in turn connected to a gas cock 19, whichis in communication with a source of gas supply 6.

The lower top face 22 of the burner 5 is provided with a series ofraised ports 23 which can be operated independently of the ports 18. Theouter ports of this portion of the burner are adapted to be placed incommunication with the central hub portion of the burner by way of thehollow spokes which: form the passageways 27. The central portion of theunderside of the burner terminates in a ground and tapered neck adaptedfor reception upon the end 25 of the Venturi mixing tube 11. Gas issupplied to themixing tube 11 by way of the fuel feed conduit 6, and isunder control of the gas cock 26. Gas from the supply conduit 6,

may be burned at either one or both of the: series of ports 18 and 23.The ports 23, of

the lower portion 22, of the burner, are supplied with gas by way of thecored passageways 27 and 27 shown in Figure 4.

By this construction it is possible to provide in a single casting, twoindependent blue flame burners of diflerent capacity, either one ofwhich may be operated independently of the other in the manner indicatedby foregoing description.

When it is desired to o erate the heater at a normal rate the gas coc 19only is opened. By operating the heater at a normal rate I meansupplylng heat to the system at .a rate equal to the radiation and otherheat losses of the system at a predetermined usable hot watertemperature.

.Thus, if it is desired tokeep on'hand a tank full of water atatemperature of approximately 150 F., a mixing tube 15 will be usedhaving an orifice 17 of such size that the B. t. u. output of the burnercomprising the ports 18, is just sufiicient to accomplish this object.It is, of course, understood that room temperature, feed watertemperature and other conditions will afiect the operation.

of this system. Any one, or the combination of all of the effectsmentioned'ordinarily will not cause the water temperature to vary any 1great extent My improved burner head 5, is mounted on When an unusualamount of hot water is desired, both of the cocks 19 and 26 are openedand gas is burned at all of'the ports of the burner 5. The ports'18 arepositioned somewhat higher than the ports 23, because the individualflames from the ports 18 are somewhat smaller than the flames from theports 23, and furthermore, because the flames from the ports 18 are usedto light the gas issuing from the ports 23 when this portion of theburneris put into use.

Immediately above the aperture formed in the bottom of the burnercommunicating with the mixer tube 11, there is provided a uniformlydeflect the gases from the mixer tube 11 to the several passageways 27of the main burner. The lower wall of the passage- "plate or horizontalwall 28 which serves to' ways 27 slant upwardly as shown in Figure 2thereby decreasing the cross-sectional area of the passageways 27 astheir outer ends are approached and in this manner supplying gas to thevarious ports 22 of the burner at a. uniform pressure. The pilot burnerportion of the burner is provided with raised ports 18-wh1ch are sopositioned that a pair of ports are provided adjacent each .of thesecondary air passages 24 formed in the burner. By

reason of this arrangement anadequate supply of a1r is provided forsupporting comustlon of the gas issuing from each of the ports 18 of thepilot burner.

My improved gas burner is not limited in its use to the particular typeof side arm'water heater shown in Figure 1.; It could be used inconnection with internal fired storage water heaters as well as the typeshown here, without any material changes in the burner construction. Itsuse could be extended to other heating appliances as well as waterheaters, particularly appliances adapted to operate normally at apredetermined rate and where it' would be advantageous to pro vlde somemeans to take care of abnormal heating demands.

I am aware that gas burners have been proposed, heretofore in which asingle burner head is utilized to provide two independentlyoperableburners. Such prior burners however are not capable of meetingthe present day stringent requirements directed to efficiency and lowcarbon monoxide production. Such requirements are fully satisfied by myimproved burner by reason of the novel method of distribution .of gas tothe lower portion of the burner in which the upper or center portion ofthe burner cooperates by providing a deflecting wall therefore and byreason of providing and locating all of the raised ports of the burnerso that each port can be freely supplied with secondary air from atleast located in the one side without interference from any of the otherburner ports.

Furthermore, it is to be understood that the particular forms ofapparatus shown and described, and the particular procedure set forth,are presented for urposes of explanation and illustration and thatvarious modifications of said apparatus and procedure can be madewithout departing from my invention as defined in the appended claims.

Having described my invention, what I claim is: 1. A blue-flame gasburner comprising a burner head having a main burner portion comprisinga centrally located inlet formed in the under side thereof and anannularly arranged ported outer passageway communicating with the inletby way of a plurality of radially disposed ported passageways, a pilotburner portion comprising a centrally located ported chamber having awall above the centrally located inlet of said main burner portionwhereby gas is deflected uniformly to the radially disposed passageways.and means for independently supplying a combustible mixture of gas andair to said main and said pilot burner portions and the burner portsformed therein.

e 2. Ablue-fiame gas burner comprising a burner head having twoindependently opcrable portions providin a large capacity burner and asmall capacity burner, the upper face of said burner head having raisedports for the burner portions with the ports of the small capacityburner located in a plane above the level of the ports of the largecapacity burner, said burner head having a hollow hub and hollow spokescommunicating with a hollow rim with the ports of the small capacityburner located in the hub and the ports of the lar e capacity burnerlocated in the spokes and dependently supplying a combustible mixture ofgas and an to the burner portions of said burner head.

3. A blue-flame gas burnercomprising a burner head having twoindependently operable portions providing a large capacity burner and asmall capacity burner, the upper face of said burner head having raisedports for the burner portions with the ports of the small capacityburner located in a plane above the level of the ports of the largecapacity burner, said burner head having a hollow hub and hollow spokescommunicating with a hollow rim'with the ports of the small capacityburner located in the hub. and the ports of the large capacity burnerspokes and rim and all of the said ports of said burner being locatedadjacent to the marginal edges of the burner communicating with rim, andmeans for ine 4. A wheel shaped hollow gas burner comprising portedhub,'rim and spoke portions, the ports of said burner being formed inthe upperface thereof and arranged in single rows about the marginaledges of the burner so as to be freely exposed to a continuous supply ofsecondary air, and means for independently controlling the fuel suppliedto said hub portion and the fuel supplied to said spoke and rimportions.

5. A wheel-shaped hollow gas burner comprising ported hub, rim and spokeportions, the ports of said burner being formed in the upper facethereof and arranged in single rows about the marginal edges of theburner so as to be freely exposed to a continuous supply of secondaryair, and a wall in said burner for uniformly deflecting gas to saidspokeportions and for separating-said hub portion from the rest of theburner so as to provide in a single burner two distinct andindependently operable burner portions.

- 6. In agas burner, a hollow burner head having a plurality ofpassageways with ports formed in the upper face of the burner head saidpassageways, a partition wall in said burner head for preventingcommunication between certain of said passageways whereby two separateand independently operable burner portions are formed in the burnerhead, one of which constitutes the central portlon of the burner head,and means for independently supplying and controlling the supply of gasto such burner portions, the gas supply of'one of such portions beingdirected vertically against an imperforate wall of the burner headwhereby it is deflected laterally and supplied at a substantiallyuniform pressure to the ports in communication with this portion of theburner.

7. In a gas burner, a hollow burner head having an upper face withburner ports formed therein and being formed with a plurality ofseparated passageways with the burner ports arranged in single rowsalong the marginal edges of such passageways whereby each burner port isexposed on at least one side to a continuous supply of fresh air tocomplete the combustion of the fuel supplied to such port, a partitionwall in said burnerhead for separating the same into two separate burnerportions, and means for independently controlling the supply of gas tothe separate burner portions of said burner head.

In testimony whereof I afiix my signature.

ARTHUR FRIEDMAN.

' 7 whereby they are supplied with secondary burner portions of saidburner head.

of gas and air to the

